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GLOBAL WARMING An Inconvenient Truth or A Convenient Lie
 
 
 
 
 
 
 
 
 
 
 
 
 
 
What should I know for the test? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
“ Intergovernmental Panel on Climate Change” Findings The Upcoming Slides are taken from IPCC Report, 2-2007 ,[object Object]
[object Object],Direct Observations of Recent Climate Change
Direct Observations of Recent Climate Change   Global mean temperature Global average sea level Northern hemisphere Snow cover
[object Object],[object Object],[object Object],[object Object],Direct Observations of Recent Climate  Change
Global mean temperatures are rising faster with time Period  Rate Years   /decade 100  0.074  0.018 50  0.128  0.026 Warmest 12 years: 1998,2005,2003,2002,2004,2006, 2001,1997,1995,1999, 1990 ,2000
Warming in the Arctic is  double  that for the globe from 19 th  to 21 st  century and from late 1960s to present. Warmth 1925 to 1950 in Arctic was not as widespread as recent global warmth. Note different scales Arctic vs Global   annual temperature anomalies (°C)
Further Changes in Artic and Frozen Ground   ,[object Object],[object Object],[object Object]
Changes in Precipitation, Increased Drought ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],Other changes in Extreme Events
Regions of disproportionate changes in heavy (95 th ) and very heavy (99 th ) precipitation  Proportion of heavy rainfalls: increasing in most land areas
The most important spatial pattern (top) of the monthly Palmer Drought Severity Index (PDSI) for 1900 to 2002.  The time series (below) accounts for most of the trend in PDSI. Drought is increasing most places Mainly decrease in rain over land in tropics and subtropics, but enhanced by increased atmospheric demand with warming
Circulation change ,[object Object]
N. Atlantic hurricane record best after 1944 with aircraft surveillance. Global number and percentage of intense hurricanes  is increasing North Atlantic hurricanes have increased with SSTs SST (1944-2005) Marked increase after 1994
Snow cover and Arctic sea ice are decreasing Spring snow cover shows 5% stepwise drop during 1980s Arctic sea ice  area decreased by 2.7% per decade (Summer:  -7.4%/decade)
Glaciers and frozen ground are receding Area of seasonally frozen ground in NH has decreased by 7% from 1901 to 2002 Increased Glacier retreat since the early 1990s
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Direct Observations of Recent Climate Change
CO 2 , CH 4  and N 2 O Concentrations - far exceed pre-industrial values - increased markedly since 1750 due to human activities Relatively little variation before the industrial era Human and Natural Drivers of Climate Change
Understanding and Attributing Climate Change ,[object Object],[object Object]
Understanding and Attributing Climate Change ,[object Object],[object Object]
Projections of Future Changes in Climate ,[object Object]
Projections of Future Changes in Climate ,[object Object],[object Object],[object Object]
Projections of Future Changes in Climate Best estimate for low scenario (B1) is 1.8°C ( likely  range is 1.1°C to 2.9°C), and for high scenario (A1FI) is 4.0°C ( likely  range is 2.4°C to 6.4°C).   Broadly consistent with span quoted for SRES in TAR, but not directly comparable
Projections of Future Changes in Climate Projected warming in 21st century  expected to be greatest over land  and at most high  northern latitudes and least over the  Southern Ocean  and parts of the  North Atlantic  Ocean
Projections of Future Changes in Climate Precipitation increases  very likely  in high latitudes Decreases  likely  in most subtropical land regions
[object Object],[object Object],[object Object],[object Object],PROJECTIONS OF FUTURE  CHANGES  IN CLIMATE
[object Object],[object Object],PROJECTIONS OF FUTURE CHANGES IN CLIMATE
[object Object],PROJECTIONS OF FUTURE CHANGES IN CLIMATE
What Global Warming?
 
 
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object]
Kyoto Protocol ,[object Object],[object Object],[object Object]
 
US Refuses To Join ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
 
 
What can you do? ,[object Object],[object Object]

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New Globalwarming

  • 1. GLOBAL WARMING An Inconvenient Truth or A Convenient Lie
  • 2.  
  • 3.  
  • 4.  
  • 5.  
  • 6.  
  • 7.  
  • 8.  
  • 9.  
  • 10.  
  • 11.  
  • 12.  
  • 13.  
  • 14.  
  • 15.  
  • 16.
  • 17.
  • 18.
  • 19. Direct Observations of Recent Climate Change Global mean temperature Global average sea level Northern hemisphere Snow cover
  • 20.
  • 21. Global mean temperatures are rising faster with time Period Rate Years  /decade 100 0.074  0.018 50 0.128  0.026 Warmest 12 years: 1998,2005,2003,2002,2004,2006, 2001,1997,1995,1999, 1990 ,2000
  • 22. Warming in the Arctic is double that for the globe from 19 th to 21 st century and from late 1960s to present. Warmth 1925 to 1950 in Arctic was not as widespread as recent global warmth. Note different scales Arctic vs Global annual temperature anomalies (°C)
  • 23.
  • 24.
  • 25.
  • 26. Regions of disproportionate changes in heavy (95 th ) and very heavy (99 th ) precipitation Proportion of heavy rainfalls: increasing in most land areas
  • 27. The most important spatial pattern (top) of the monthly Palmer Drought Severity Index (PDSI) for 1900 to 2002. The time series (below) accounts for most of the trend in PDSI. Drought is increasing most places Mainly decrease in rain over land in tropics and subtropics, but enhanced by increased atmospheric demand with warming
  • 28.
  • 29. N. Atlantic hurricane record best after 1944 with aircraft surveillance. Global number and percentage of intense hurricanes is increasing North Atlantic hurricanes have increased with SSTs SST (1944-2005) Marked increase after 1994
  • 30. Snow cover and Arctic sea ice are decreasing Spring snow cover shows 5% stepwise drop during 1980s Arctic sea ice area decreased by 2.7% per decade (Summer: -7.4%/decade)
  • 31. Glaciers and frozen ground are receding Area of seasonally frozen ground in NH has decreased by 7% from 1901 to 2002 Increased Glacier retreat since the early 1990s
  • 32.
  • 33. CO 2 , CH 4 and N 2 O Concentrations - far exceed pre-industrial values - increased markedly since 1750 due to human activities Relatively little variation before the industrial era Human and Natural Drivers of Climate Change
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  • 38. Projections of Future Changes in Climate Best estimate for low scenario (B1) is 1.8°C ( likely range is 1.1°C to 2.9°C), and for high scenario (A1FI) is 4.0°C ( likely range is 2.4°C to 6.4°C). Broadly consistent with span quoted for SRES in TAR, but not directly comparable
  • 39. Projections of Future Changes in Climate Projected warming in 21st century expected to be greatest over land and at most high northern latitudes and least over the Southern Ocean and parts of the North Atlantic Ocean
  • 40. Projections of Future Changes in Climate Precipitation increases very likely in high latitudes Decreases likely in most subtropical land regions
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  • 56.